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[Launchpad Bug Tracker <1274466@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/apt

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https://bugs.launchpad.net/bugs/1274466

Title:
  apt-ftparchive on-disk cache format changed between lucid and precise,
  results in Packages files with silently corrupted checksums fields

Status in “apt” package in Ubuntu:
  Fix Released
Status in “apt” source package in Precise:
  Fix Committed
Status in “apt” source package in Trusty:
  Fix Committed

Bug description:
  Test case:
  - generate a cachedb with apt-ftparchive from lucid via
     apt-ftparchive --db old-db 2vcard_0.5-3_all.deb
  - use apt-ftparchive from precise and run
     apt-ftparchive --db old-db 2vcard_0.5-3_all.deb
    and verify that the hashsums are no longer correct
  - use apt-ftparchive from precise-proposed and run:
      apt-ftparchive --db old-db 2vcard_0.5-3_all.deb
    and verify that the hashes are correct now

  
  The archive.ubuntu.com master server has just been upgraded from lucid to precise.  As a result, the apt version went from 0.7.25.3 to 0.8.16~exp12, and apparently some time in that interval the on-disk format of apt-ftparchive's cache changed.

  This wouldn't be a problem, except apt-ftparchive itself doesn't
  *notice* that the cache format has changed, and instead happily reads
  the existing files and parses them incorrectly, resulting in corrupted
  checksums output in the Packages file for each of the .debs.

  apt-ftparchive should version its file formats so that it correctly
  notices incompatible cache files.

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